how much difference in fuel mileage will you get out of this conversion ?
31189
I didn't get any the injectors in my truck were burned up and this is the only design they have for these vehicles there was a problem with the original configuration from gm and they had a lot of problems with the original design and had a recall notic for the old style mechanical injectors n went to these electronic ones
31190
No difference at all.. But it did solve my problem of rough idle and engine misfire..
31191
Dusty, I can't tell you how much of an improvement it was because I hadn't really kept track prior to the conversion. However, I did take a trip from Oregon to Yellowstone and then down to Colorado this summer in my fully loaded down 3/4 ton suburban with a 5.7L V8. I am not a slow driver either. I typically do 75 to 80mph on the freeways and backroads. Anyway, I averaged 14mpg which I was pretty happy with considering the weight of luggage and a larger family. Hope that helps!
31192
None, but my tahoe runs much smoother now and it feels like it has more power.
1967245
I have a 2010 JK with cold air intake and larger tires and it did make a noticeable difference. The shift points have changed and at freeway speeds I am not having to floor it to make it up some hills. The throttle response has improved too, not a kick in the pants difference but one that you can tell. As for mileage, I measured it for 3 weeks before I programmed and I was getting about 17.1 mpg after the tune I was getting 19.3 mpg. I drove it the exact same so I can say with 100% clarity that for me it did improve the mileage.
1933764
I can't give you the perfect answer but my mpg went up about 1.5 in the city and about 2.5 to 3 on the high way and the truck has more throttle reponse
1160130
Its not crazy---- more for the torque... really imporved the torque... Gas... MAYBE 2 gallons. mile
1176643
You will have to adjust fuel metering needle, but very simple adjustment will be 1 and 1/2 turns out then go in or out until engine runs smooth.
747027
Better throttle response. Gas mileage goes down about three per gallon. You need to add the throttle spacer and possibly stainless steel dual exhaust for best performance.
1353866
Overall my mileage dropped about the same amount ~15% that the performance increased according to the run on the dyno after the installation. I put a new higher flowing air cleaner, and exhaust system at the same time. Most of the decrease mileage is caused by me using the extra power. If I cruise gently, I get close to the same mileage. There should be a slight decrease from the fact that H-D runs the engine leaner than what is good practice for keeping the engine from overheating. At least that is the story that I have been told by several people. The Cobra tends to add a bit more fuel to the mix which is probably worse for emissions and mileage, but better for engine life. YMMV and YPerformanceMV Overall my mileage dropped about the same amount ~15% that the performance increased according to the run on the dyno after the installation. I put a new higher flowing air cleaner, and exhaust system at the same time. Most of the decrease mileage is caused by me using the extra power. If I cruise gently, I get close to the same mileage. There should be a slight decrease from the fact that H-D runs the engine leaner than what is good practice for keeping the engine from overheating. At least that is the story that I have been told by several people. The Cobra tends to add a bit more fuel to... » Read More Overall my mileage dropped about the same amount ~15% that the performance increased according to the run on the dyno after the installation. I put a new higher flowing air cleaner, and exhaust system at the same time. Most of the decrease mileage is caused by me using the extra power. If I cruise gently, I get close to the same mileage. There should be a slight decrease from the fact that H-D runs the engine leaner than what is good practice for keeping the engine from overheating. At least that is the story that I have been told by several people. The Cobra tends to add a bit more fuel to the mix which is probably worse for emissions and mileage, but better for engine life. YMMV and YPerformanceMV « Show Less
1353870
Will loose about 4 mpg but bikes come lean from factory so it makes it run richer and cooler. Better for ur motor in the long run. Friend me on Facebook . David dabeast laws
1439016
Yes, I am getting 1 or 2 mpg better than without it. For an upgrade this well priced, you can't go wrong really.
1258797
i really have not compared before and after. on the highway i average 26-27 mpg. i have really noticed a power increase and i just love the sound when i put my foot to the floor.
534062
I would say no for an upgrade. Unless your motor goes out or is making a lot of noise, it's probably not going to make a noticeable difference.
398740
No it won't as long as you maintain your oil changes and servicing... I have actually gained 20-30 km per tank
664756
Gas mileage didn't really change but it does seem to have more power. More in throttle response than anything.
152742
I have a 2004 F250 V10 the gas mileage went from 11-13 MPG to 13-15 but the power is must more noticeable with regular gas and even more with premium
120261
Not sure about the 4.7 . We put it on a 2003 Dodge diesel and we gained about 4 mpg.
1697362
I can't give you a specific number for gas consumption but it appears to be considerably less than the unit which it replaced.
926064
I thought I might have seen a 1 mpg increase in the early months, but now I'm not sure if that was maybe due to something else. I haven't really seen anything that would indicate a significant decrease, either.Probably I'd say if there is a difference it's not much more than 1 mpg either way. I do mostly drive the truck around town, though and when I do take it on longer trips, I get away from using CA gas, which usually increases my mileage regardless of anything else due to lower ethanol content.